All Questions
17
questions
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29
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If a spacesuit cracks open, does the astronaut blow up due to difference of pressure? [duplicate]
Me and my friends had a discussion on emergencies in outer space. One questioned what would happen if a spacesuit ruptured and exposed an astronaut to vaccuum. One claimed that since there is no ...
0
votes
1
answer
78
views
The suction and thrust of an aircraft engine
Does only the air sucked in (not the air that is ejected at the back of the engine) by an airliner engine (turbofan engine) causes a thrust forward or in other words pull the engine forward? and why ?
...
0
votes
0
answers
46
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What causes the Coandă effect? [duplicate]
What causes the Coandă effect? Here's my understanding of it:
When a fluid flows around a curved surface it has high velocity and so low pressure its pressure will be lower than the atmospheric ...
- 75
2
votes
4
answers
1k
views
Reason for lower air pressure above an airplane wing
I am posing this question from the perspective of a novice. I read an article, from Scientific American, titled "No One Can Explain Why Planes Stay in the Air". The article explains how, while we ...
- 219
0
votes
0
answers
176
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Thrust needed from an engine to reach orbit
Assume you had an airplane with magical engines that didn't need fuel, air or power, to operate. What thrust to ground weight ratio would the airplane need to reach orbit? By ground weight I mean mass ...
- 652
0
votes
1
answer
138
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Airplane trails
Some airplanes leave a trail through some regions of sky. This post explains why it is so, but it seems not enough.
The trail is said to be made mostly of water which, on a specific altitude, ...
user153036
2
votes
3
answers
720
views
Is fuelless aviation possible?
I've read the article Gravity powered aircraft flies with no fuel. This is making me confusion, as I can not discern if it is credible.
Is it an hoax?
- 169
8
votes
2
answers
3k
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Beryllium Vacuum Sphere Boat/Aircraft [closed]
Is it possible to make a solid rigid evacuated "balloon" out of Beryllium or other elements or alloys?
The critical buckling pressure at which an evacuated sphere is given as
$$
P_1=\frac{2E\cdot\...
user43692
1
vote
2
answers
2k
views
Hot Air Balloons: how is the Lift related to environmental conditions?
I'd like to build a small hot air balloon big enough to carry 0.8kg (a camera). The first thing I need to know is: once I have a big enough plastic bag and a big enough source of fire, how much will ...
- 153
1
vote
0
answers
47
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Remote control wireless helicopter hovering in cruising aircraft, will it move the aircraft with stability [duplicate]
A Mini Toy Helicopter is left for hovering inside the cabin of an Aircraft, while the aircraft is cruising at the speed of 900 Km/h. Helicopter has no contact with the surface of the aircraft.
The ...
2
votes
2
answers
296
views
What mechanisms exist for generating lift on a static object?
What mechanisms exist for generating lift on a static object?
Condition is: Other than propellers
I know that generating lift on a static object in a sense of anti-gravity for e.g. drone is not ...
- 604
6
votes
3
answers
788
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atmospheric phenomenon? What causes condensation trails to converge?
This air plane just caught my eye. Two contrails apparently are flowing backward, slightly off-centered and then ultimately converge, giving the overall shape of a very narrow rhomboid parallelogram, ...
- 183
8
votes
2
answers
4k
views
Paper plane between two fans - is this possible?
The setup: two fans facing each other, distance around 1m. Both are turned on. In between them, place a simple paper plane and according to this video, it will fly.
https://www.youtube.com/watch?v=...
- 247
14
votes
8
answers
10k
views
Does it take significantly more fuel to fly a heavier airplane?
I was reading in the papers how some-airline-or-the-other increased their prices for extra luggage, citing increased fuel costs.
Now I'm a bit skeptical. Using the (wrong) Bernoulli-effect ...
- 19k
2
votes
1
answer
1k
views
How does a V formation save fuel for the lead plane?
I'm watching an episode of Mythbusters where they show aircraft saving 3-5% fuel when flying in a tight V formation. Interestingly, this also applies for the lead airplane.
How is that possible for ...
- 255